<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			#nav{
				height: 120px;
				background-color: blue;
			}
			#content{
				/*height: 1000px;*/
			}
			.clear:after{
				zoom:1; 
				height: 0;
				content: '';
				display: block;
				clear:both;
			}
			#content #left,#content #right{
				float: left;
				width: 200px;
				background-color: darkcyan;
				margin: 2px;
			}
			#footer{
				height: 80px;
				background-color: red;
			}
		</style>
	</head>
	<body>
		<div id="nav"> 
		</div>
		<div id="content" class="clear">
			<div id="left">
				<ul>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li><li>aaaa</li>
					
					<li>aaaa</li><li>aaaa</li>
					
					<li>aaaa</li><li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
					
					<li>aaaa</li>
					<li>aaaa</li>
					<li>aaaa</li>
				</ul>
			</div>
			<div id="right">
				<ul>
					<li>111</li>
					<li>222</li>
					<li>3333</li>
					<li>444</li>
					<li>555</li>
				</ul>
			</div>
		</div>
		<div id="footer"></div>
	</body>
</html>
